Implement the -mflip-thump option. Undocumented for internal testing
only. This option artificially inserts alternative attribute thumb/modes
on functions.
This close the patch set. Thanks for your review,
Christian
2014-09-23 Christian Bruel <christian.br...@st.com>
* config/arm/arm.c (add_attribute, arm_insert_attributes): New functions
(TARGET_INSERT_ATTRIBUTES): Define.
(thumb_flipper): New var.
* config/arm/arm.opt (-mflip-thumb): New switch.
diff '--exclude=ChangeLog*' '--exclude=.svn' '--exclude=*~' '--exclude=#*#' -rupN f/gcc/gcc/config/arm/arm.c g/gcc/gcc/config/arm/arm.c
--- f/gcc/gcc/config/arm/arm.c 2014-11-18 13:16:44.000000000 +0100
+++ g/gcc/gcc/config/arm/arm.c 2014-11-19 14:04:22.000000000 +0100
@@ -218,6 +218,7 @@ static void arm_encode_section_info (tre
static void arm_file_end (void);
static void arm_file_start (void);
+static void arm_insert_attributes (tree, tree *);
static void arm_setup_incoming_varargs (cumulative_args_t, machine_mode,
tree, int *, int);
@@ -370,6 +371,9 @@ static const struct attribute_spec arm_a
#undef TARGET_ATTRIBUTE_TABLE
#define TARGET_ATTRIBUTE_TABLE arm_attribute_table
+#undef TARGET_INSERT_ATTRIBUTES
+#define TARGET_INSERT_ATTRIBUTES arm_insert_attributes
+
#undef TARGET_ASM_FILE_START
#define TARGET_ASM_FILE_START arm_file_start
#undef TARGET_ASM_FILE_END
@@ -29403,6 +29407,56 @@ arm_valid_target_attribute_tree (tree ar
return t;
}
+/* True if -mflip-thumb should next add an attribute for the default
+ mode, false if it should next add an attribute for the opposite mode. */
+static GTY(()) bool thumb_flipper = TARGET_THUMB;
+
+static void
+add_attribute (const char * mode, tree *attributes)
+{
+ size_t len = strlen (mode);
+ tree value = build_string (len, mode);
+
+ TREE_TYPE (value) = build_array_type (char_type_node,
+ build_index_type (size_int (len)));
+
+ *attributes = tree_cons (get_identifier ("target"),
+ build_tree_list (NULL_TREE, value),
+ *attributes);
+}
+
+/* For testing. Insert thumb or arm modes alternatively on functions. */
+
+static void
+arm_insert_attributes (tree fndecl, tree * attributes)
+{
+ const char *mode;
+
+ if (TREE_CODE (fndecl) != FUNCTION_DECL || DECL_EXTERNAL(fndecl)
+ || DECL_BUILT_IN (fndecl) || DECL_ARTIFICIAL (fndecl))
+ return;
+
+ /* Nested definitions must inherit mode. */
+ if (current_function_decl)
+ {
+ mode = TARGET_THUMB ? "thumb" : "arm";
+ add_attribute (mode, attributes);
+ return;
+ }
+
+ if (! TARGET_FLIP_THUMB)
+ return;
+
+ /* If there is already a setting don't change it. */
+ if (lookup_attribute ("target", *attributes) != NULL)
+ return;
+
+ mode = thumb_flipper ? "thumb" : "arm";
+ add_attribute (mode, attributes);
+
+ thumb_flipper = !thumb_flipper;
+}
+
/* Hook to validate attribute((target("string"))). */
static bool
diff '--exclude=ChangeLog*' '--exclude=.svn' '--exclude=*~' '--exclude=#*#' -rupN f/gcc/gcc/config/arm/arm.opt g/gcc/gcc/config/arm/arm.opt
--- f/gcc/gcc/config/arm/arm.opt 2014-11-13 14:05:34.000000000 +0100
+++ g/gcc/gcc/config/arm/arm.opt 2014-11-19 13:59:46.000000000 +0100
@@ -122,6 +122,10 @@ Enum(float_abi_type) String(softfp) Valu
EnumValue
Enum(float_abi_type) String(hard) Value(ARM_FLOAT_ABI_HARD)
+mflip-thumb
+Target Report Var(TARGET_FLIP_THUMB)
+Switch ARM/Thumb modes on alternating functions for compiler testing
+
mfp16-format=
Target RejectNegative Joined Enum(arm_fp16_format_type) Var(arm_fp16_format) Init(ARM_FP16_FORMAT_NONE)
Specify the __fp16 floating-point format
